Drive for the axial motion of the camshaft on ordinary straight-bar knitting machines



March 7, 1950 u. PIANTA 2,

DRIVE FOR THE AXI MOTION OF E CAM AFT 0N ORDINARY STRAI T-BAR KNITT GMAC NES Filed Dec. 15, 1947 Q firln li I III I Fl 6. Z.

IN VEN TOR.

Y Lil-dd Kim Fl 6. I.

ATTORNEY Patented Mar. 1, 950 zgwyg DRIVE FOR THE AXIAL MOTION OF THECAMSHAFT N ORDINARY STRAIGHT- BAR KNITTING MACHINES Ubaldo Pianta,Milan, Italy, assignor to firm Societa Italiana Ernesto Breda PerCostruzioni Meccaniche, Milan, Italy Application December 13, 1947,Serial No. 791,527 7 In Italy December 13, 1946 The cam shaft onordinary straight-bar knitting machines of the Cotton type is usuallydriving by a roller located so as to have its axis of rotationperpendicular to the cam shafts, and which can be radially displacedwith respect to said cam shaft, 50 as to co-operate with two cams keyedon said shaft; or also two parallel rollers similarly located areemployed, cooperating by axial displacement with a cam, showing thedriving surfaces, and fitted between same rollers.

The first named system has the advantage of a simpler design; however,it also has the disadvantage that the roller is working in bothdirections, in consequence of which plays are easily produced, whichinterfere with the correct operation of the mechanism; said drawback isnot encountered on the second named mechanism, but this is attained atthe expenses of a far more complicated design.

The device according to this invention has the advantages of both abovedescribed systems, i. e., a higher resistance to wear together with thesimplest conceivable design, preventing at the same time allabove-stated drawbacks. Other advantages of the invention will beapparent from the following description.

The peculiar feature of the device according to this invention consistsin that a pair of rollers are supported by a member which is radiallymovable with respect to the cam shaft, on which shaft is keyed a disc,provided on its side-surfaces with axial projections, which engagerespectively the one or the other roller, according to the position ofsaid radially movable member, in such a manner as to oblige said camshaft to axially displace according to the position of said member.

In the accompanying drawing is shown one of the possible manners ofcarrying the invention into effect, in order to more clearly explainwhat has been stated above.

Fig. 1 is a cross section, normal to the centre line of the cam shaft.

Fig. 2 is a section along said axis.

In the drawing, the cam shaft I is supported by the frame member 2, inaxially displaceable manner. On said shaft I is firmly secured the camdisc 3, which shows on its two sides respectively, two cam surfaces 4and 5, which are cut down in correspondence at the sector 6, and show acircular profile, with the exception of a radial projection 'I.

On the frame member 2 is firmly secured the guide 8, along whichtravels, in a radial direction with respect to the shaft I, the slide 9,which is urged upwards by the spring III and is kept locked.

3 Claims. (Cl. 66-432) 2 downwards by the stop I I, when this latter isin the position shown by Fig. 1. The stop I I is operated by the leverI2, which is controlled in the already known manner. Upon the slide 9are fitted the three rollers I3, It and I5.

The operation of the device can easily be understood from the drawingand the above descrip- 7 tion.

When the various members are in the position shown by the figures, theslide 9 is kept down, the roller I5 is engaged with the arcuate camprofile 5 and consequently the shaft I is displaced to the right, whenlooking at Fig. 2.

Now, if the lever I2 is actuated so as to unlock the stop I I of theslide 9, this latter is driven upwards by the spring I0, so that, whilethe shaft I is revolving, the roller I3 follows the profile of theprojection 1, coming nearer to the axis of the shaft I, and allowing theslide 9 to be driven upwards. This takes place in correspondence withthe position of the sector 6, on account of which the roller I I alsocan be lifted, being no more kept locked down by the cam profile 4.

Then, during the further revolving motion of the cam disc 3, the camprofile at comes in front of the roller I4, and by reacting on sameroller causes the whole shaft I to displace to the left.

Now, if the lever I2 is brought back to the position shown on Fig. 1,when the projection 1 causes the roller I3 and the slide 9 to be broughtdown again, and slide 9 is locked in its down position by stop II, whichagain becomes operative, so that when the cam profile 5 acts again onthe roller I5, this latter causes the shaft I to displace to the right.

As it will be noticed, on the position of the lever I 2 depends theposition which is at once taken and kept by the shaft I.

I claim:

1. Means to effect axial movement of the cam shaft of a straight barknitting machine, said means including a cam disc fixed on the camshaft, camming ribs extending from opposite sides of said disc andextending concentric to the cam shaft, a member mounted for movementtoward and from said cam shaft radially thereof, said member beingalined opposite said cam disc, and a pair of rollers mounted on saidmembers, on opposite sides of said cam disc, and selectively engagablewith said camming ribs.

2. Means to effect axial movement of the cam shaft of a straight barknitting machine, said means including a cam disc fixed on the camshaft, camming ribs extending from opposite sides of Said disc andextending concentric to the cam shaft, a, member mounted for movementtoward and from said cam shaft radially therof, said member being alinedopposite said cam disc, 2. pair of rollers mounted on said member onopposite sides of said cam disc, and selectively engagable with saidcamming ribs, a spring urging said member towards the cam shaft, and athird roller mounted on said member opposite the edge of said disc, saiddisc having a projection intermittently engaging the third roller andmoving said member against the action of said spring.

3. Means to effect axial movement of the cam shaft of a straight barknitting machine, said means including a cam disc fixed on the camshaft, camming ribs extending from opposite sides of said disc andextending concentric to the cam shaft, a member mounted for movementtoward and from said cam shaft radially thereof, said member beingalined opposite said cam disc, 2; pair of rollers mounted on saidmember, on opposite sides of said cam disc, and selectively engageablewith said camming ribs, a spring urging said member towards the camshaft, a third roller mounted on said member opposite the edge of saiddisc, said disc havinga projection intermittently engaging the thirdroller and moving said member against the action of said spring, and areleasable stop in the path of said member and restraining said memberagainst movement by said spring.

UBALDO PIANTA.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

